Make USM pools optional with a device query to report support.

Author: aarongreig

include/ur_api.h

@@ -1639,6 +1639,9 @@ typedef enum ur_device_info_t {
     UR_DEVICE_INFO_GLOBAL_VARIABLE_SUPPORT = 118,                    ///< [::ur_bool_t] return true if the device supports the
                                                                      ///< `EnqueueDeviceGlobalVariableWrite` and
                                                                      ///< `EnqueueDeviceGlobalVariableRead` entry points.
+    UR_DEVICE_INFO_USM_POOL_SUPPORT = 119,                           ///< [::ur_bool_t] return true if the device supports USM pooling. Pertains
+                                                                     ///< to the `USMPool` entry points and usage of the `pool` parameter of the
+                                                                     ///< USM alloc entry points.
     UR_DEVICE_INFO_COMMAND_BUFFER_SUPPORT_EXP = 0x1000,              ///< [::ur_bool_t] Returns true if the device supports the use of
                                                                      ///< command-buffers.
     UR_DEVICE_INFO_COMMAND_BUFFER_UPDATE_CAPABILITIES_EXP = 0x1001,  ///< [::ur_device_command_buffer_update_capability_flags_t] Command-buffer
@@ -3536,6 +3539,8 @@ typedef struct ur_usm_pool_limits_desc_t {
 ///         + `size` is greater than ::UR_DEVICE_INFO_MAX_MEM_ALLOC_SIZE.
 ///     - ::UR_RESULT_ERROR_OUT_OF_HOST_MEMORY
 ///     - ::UR_RESULT_ERROR_OUT_OF_RESOURCES
+///     - ::UR_RESULT_ERROR_UNSUPPORTED_FEATURE
+///         + If any device associated with `hContext` reports `false` for ::UR_DEVICE_INFO_USM_POOL_SUPPORT
 UR_APIEXPORT ur_result_t UR_APICALL
 urUSMHostAlloc(
     ur_context_handle_t hContext,  ///< [in] handle of the context object
@@ -3583,6 +3588,8 @@ urUSMHostAlloc(
 ///         + `size` is greater than ::UR_DEVICE_INFO_MAX_MEM_ALLOC_SIZE.
 ///     - ::UR_RESULT_ERROR_OUT_OF_HOST_MEMORY
 ///     - ::UR_RESULT_ERROR_OUT_OF_RESOURCES
+///     - ::UR_RESULT_ERROR_UNSUPPORTED_FEATURE
+///         + If any device associated with `hContext` reports `false` for ::UR_DEVICE_INFO_USM_POOL_SUPPORT
 UR_APIEXPORT ur_result_t UR_APICALL
 urUSMDeviceAlloc(
     ur_context_handle_t hContext,  ///< [in] handle of the context object
@@ -3632,6 +3639,8 @@ urUSMDeviceAlloc(
 ///         + If `UR_DEVICE_INFO_USM_SINGLE_SHARED_SUPPORT` and `UR_DEVICE_INFO_USM_CROSS_SHARED_SUPPORT` are both false.
 ///     - ::UR_RESULT_ERROR_OUT_OF_HOST_MEMORY
 ///     - ::UR_RESULT_ERROR_OUT_OF_RESOURCES
+///     - ::UR_RESULT_ERROR_UNSUPPORTED_FEATURE
+///         + If any device associated with `hContext` reports `false` for ::UR_DEVICE_INFO_USM_POOL_SUPPORT
 UR_APIEXPORT ur_result_t UR_APICALL
 urUSMSharedAlloc(
     ur_context_handle_t hContext,  ///< [in] handle of the context object
@@ -3713,6 +3722,8 @@ urUSMGetMemAllocInfo(
 ///         + `::UR_USM_POOL_FLAGS_MASK & pPoolDesc->flags`
 ///     - ::UR_RESULT_ERROR_INVALID_VALUE
 ///     - ::UR_RESULT_ERROR_OUT_OF_HOST_MEMORY
+///     - ::UR_RESULT_ERROR_UNSUPPORTED_FEATURE
+///         + If any device associated with `hContext` reports `false` for ::UR_DEVICE_INFO_USM_POOL_SUPPORT
 UR_APIEXPORT ur_result_t UR_APICALL
 urUSMPoolCreate(
     ur_context_handle_t hContext,  ///< [in] handle of the context object
@@ -3731,6 +3742,7 @@ urUSMPoolCreate(
 ///     - ::UR_RESULT_ERROR_ADAPTER_SPECIFIC
 ///     - ::UR_RESULT_ERROR_INVALID_NULL_HANDLE
 ///         + `NULL == pPool`
+///     - ::UR_RESULT_ERROR_UNSUPPORTED_FEATURE
 UR_APIEXPORT ur_result_t UR_APICALL
 urUSMPoolRetain(
     ur_usm_pool_handle_t pPool ///< [in][retain] pointer to USM memory pool
@@ -3753,6 +3765,7 @@ urUSMPoolRetain(
 ///     - ::UR_RESULT_ERROR_ADAPTER_SPECIFIC
 ///     - ::UR_RESULT_ERROR_INVALID_NULL_HANDLE
 ///         + `NULL == pPool`
+///     - ::UR_RESULT_ERROR_UNSUPPORTED_FEATURE
 UR_APIEXPORT ur_result_t UR_APICALL
 urUSMPoolRelease(
     ur_usm_pool_handle_t pPool ///< [in][release] pointer to USM memory pool
@@ -3794,6 +3807,7 @@ typedef enum ur_usm_pool_info_t {
 ///         + `pPropValue == NULL && pPropSizeRet == NULL`
 ///     - ::UR_RESULT_ERROR_OUT_OF_HOST_MEMORY
 ///     - ::UR_RESULT_ERROR_OUT_OF_RESOURCES
+///     - ::UR_RESULT_ERROR_UNSUPPORTED_FEATURE
 UR_APIEXPORT ur_result_t UR_APICALL
 urUSMPoolGetInfo(
     ur_usm_pool_handle_t hPool,  ///< [in] handle of the USM memory pool

include/ur_print.hpp

@@ -2550,6 +2550,9 @@ inline std::ostream &operator<<(std::ostream &os, enum ur_device_info_t value) {
     case UR_DEVICE_INFO_GLOBAL_VARIABLE_SUPPORT:
         os << "UR_DEVICE_INFO_GLOBAL_VARIABLE_SUPPORT";
         break;
+    case UR_DEVICE_INFO_USM_POOL_SUPPORT:
+        os << "UR_DEVICE_INFO_USM_POOL_SUPPORT";
+        break;
     case UR_DEVICE_INFO_COMMAND_BUFFER_SUPPORT_EXP:
         os << "UR_DEVICE_INFO_COMMAND_BUFFER_SUPPORT_EXP";
         break;
@@ -4052,6 +4055,18 @@ inline ur_result_t printTagged(std::ostream &os, const void *ptr, ur_device_info
 
         os << ")";
     } break;
+    case UR_DEVICE_INFO_USM_POOL_SUPPORT: {
+        const ur_bool_t *tptr = (const ur_bool_t *)ptr;
+        if (sizeof(ur_bool_t) > size) {
+            os << "invalid size (is: " << size << ", expected: >=" << sizeof(ur_bool_t) << ")";
+            return UR_RESULT_ERROR_INVALID_SIZE;
+        }
+        os << (const void *)(tptr) << " (";
+
+        os << *tptr;
+
+        os << ")";
+    } break;
     case UR_DEVICE_INFO_COMMAND_BUFFER_SUPPORT_EXP: {
         const ur_bool_t *tptr = (const ur_bool_t *)ptr;
         if (sizeof(ur_bool_t) > size) {

scripts/core/device.yml

@@ -441,6 +441,8 @@ etors:
       desc: "[$x_device_handle_t] The composite device containing this component device."
     - name: GLOBAL_VARIABLE_SUPPORT
       desc: "[$x_bool_t] return true if the device supports the `EnqueueDeviceGlobalVariableWrite` and `EnqueueDeviceGlobalVariableRead` entry points."
+    - name: USM_POOL_SUPPORT
+      desc: "[$x_bool_t] return true if the device supports USM pooling. Pertains to the `USMPool` entry points and usage of the `pool` parameter of the USM alloc entry points."
 --- #--------------------------------------------------------------------------
 type: function
 desc: "Retrieves various information about device"

scripts/core/usm.yml

@@ -264,6 +264,8 @@ returns:
       - "`size` is greater than $X_DEVICE_INFO_MAX_MEM_ALLOC_SIZE."
     - $X_RESULT_ERROR_OUT_OF_HOST_MEMORY
     - $X_RESULT_ERROR_OUT_OF_RESOURCES
+    - $X_RESULT_ERROR_UNSUPPORTED_FEATURE:
+        - "If any device associated with `hContext` reports `false` for $X_DEVICE_INFO_USM_POOL_SUPPORT"
 --- #--------------------------------------------------------------------------
 type: function
 desc: "USM allocate device memory"
@@ -309,6 +311,8 @@ returns:
       - "`size` is greater than $X_DEVICE_INFO_MAX_MEM_ALLOC_SIZE."
     - $X_RESULT_ERROR_OUT_OF_HOST_MEMORY
     - $X_RESULT_ERROR_OUT_OF_RESOURCES
+    - $X_RESULT_ERROR_UNSUPPORTED_FEATURE:
+        - "If any device associated with `hContext` reports `false` for $X_DEVICE_INFO_USM_POOL_SUPPORT"
 --- #--------------------------------------------------------------------------
 type: function
 desc: "USM allocate shared memory"
@@ -355,6 +359,8 @@ returns:
       - "If `UR_DEVICE_INFO_USM_SINGLE_SHARED_SUPPORT` and `UR_DEVICE_INFO_USM_CROSS_SHARED_SUPPORT` are both false."
     - $X_RESULT_ERROR_OUT_OF_HOST_MEMORY
     - $X_RESULT_ERROR_OUT_OF_RESOURCES
+    - $X_RESULT_ERROR_UNSUPPORTED_FEATURE:
+        - "If any device associated with `hContext` reports `false` for $X_DEVICE_INFO_USM_POOL_SUPPORT"
 --- #--------------------------------------------------------------------------
 type: function
 desc: "Free the USM memory object"
@@ -424,6 +430,8 @@ returns:
     - $X_RESULT_ERROR_INVALID_NULL_HANDLE
     - $X_RESULT_ERROR_INVALID_VALUE
     - $X_RESULT_ERROR_OUT_OF_HOST_MEMORY
+    - $X_RESULT_ERROR_UNSUPPORTED_FEATURE:
+        - "If any device associated with `hContext` reports `false` for $X_DEVICE_INFO_USM_POOL_SUPPORT"
 --- #--------------------------------------------------------------------------
 type: function
 desc: "Get a reference to the pool handle. Increment its reference count"
@@ -436,6 +444,7 @@ params:
       desc: "[in][retain] pointer to USM memory pool"
 returns:
     - $X_RESULT_ERROR_INVALID_NULL_HANDLE
+    - $X_RESULT_ERROR_UNSUPPORTED_FEATURE
 --- #--------------------------------------------------------------------------
 type: function
 desc: "Decrement the pool's reference count and delete the pool if the reference count becomes zero."
@@ -452,6 +461,7 @@ params:
       desc: "[in][release] pointer to USM memory pool"
 returns:
     - $X_RESULT_ERROR_INVALID_NULL_HANDLE
+    - $X_RESULT_ERROR_UNSUPPORTED_FEATURE
 --- #--------------------------------------------------------------------------
 type: enum
 desc: "Get USM memory pool information"
@@ -499,3 +509,4 @@ returns:
         - "`pPropValue == NULL && pPropSizeRet == NULL`"
     - $X_RESULT_ERROR_OUT_OF_HOST_MEMORY
     - $X_RESULT_ERROR_OUT_OF_RESOURCES
+    - $X_RESULT_ERROR_UNSUPPORTED_FEATURE

source/adapters/cuda/device.cpp

@@ -1076,6 +1076,8 @@ UR_APIEXPORT ur_result_t UR_APICALL urDeviceGetInfo(ur_device_handle_t hDevice,
     return ReturnValue(static_cast<ur_bool_t>(false));
   case UR_DEVICE_INFO_GLOBAL_VARIABLE_SUPPORT:
     return ReturnValue(static_cast<ur_bool_t>(true));
+  case UR_DEVICE_INFO_USM_POOL_SUPPORT:
+    return ReturnValue(static_cast<ur_bool_t>(true));
   case UR_DEVICE_INFO_COMPONENT_DEVICES:
   case UR_DEVICE_INFO_COMPOSITE_DEVICE:
   case UR_DEVICE_INFO_MAX_READ_WRITE_IMAGE_ARGS:

source/adapters/hip/device.cpp

@@ -889,6 +889,8 @@ UR_APIEXPORT ur_result_t UR_APICALL urDeviceGetInfo(ur_device_handle_t hDevice,
 
   case UR_DEVICE_INFO_GLOBAL_VARIABLE_SUPPORT:
     return ReturnValue(ur_bool_t{false});
+  case UR_DEVICE_INFO_USM_POOL_SUPPORT:
+    return ReturnValue(ur_bool_t{true});
   // TODO: Investigate if this information is available on HIP.
   case UR_DEVICE_INFO_COMPONENT_DEVICES:
   case UR_DEVICE_INFO_COMPOSITE_DEVICE:

source/adapters/level_zero/device.cpp

@@ -1155,6 +1155,8 @@ ur_result_t urDeviceGetInfo(
     return ReturnValue(false);
   case UR_DEVICE_INFO_GLOBAL_VARIABLE_SUPPORT:
     return ReturnValue(true);
+  case UR_DEVICE_INFO_USM_POOL_SUPPORT:
+    return ReturnValue(true);
   default:
     logger::error("Unsupported ParamName in urGetDeviceInfo");
     logger::error("ParamNameParamName={}(0x{})", ParamName,

source/adapters/native_cpu/device.cpp

@@ -414,6 +414,9 @@ UR_APIEXPORT ur_result_t UR_APICALL urDeviceGetInfo(ur_device_handle_t hDevice,
   case UR_DEVICE_INFO_ENQUEUE_NATIVE_COMMAND_SUPPORT_EXP:
     return ReturnValue(false);
 
+  case UR_DEVICE_INFO_USM_POOL_SUPPORT:
+    return ReturnValue(false);
+
   default:
     DIE_NO_IMPLEMENTATION;
   }

source/adapters/opencl/device.cpp

@@ -1048,6 +1048,11 @@ UR_APIEXPORT ur_result_t UR_APICALL urDeviceGetInfo(ur_device_handle_t hDevice,
   case UR_DEVICE_INFO_KERNEL_SET_SPECIALIZATION_CONSTANTS: {
     return ReturnValue(false);
   }
+
+  case UR_DEVICE_INFO_USM_POOL_SUPPORT: {
+    return ReturnValue(false);
+  }
+
   /* TODO: Check regularly to see if support is enabled in OpenCL. Intel GPU
    * EU device-specific information extensions. Some of the queries are
    * enabled by cl_intel_device_attribute_query extension, but it's not yet in

source/adapters/opencl/ur_interface_loader.cpp

@@ -238,10 +238,10 @@ urGetUSMProcAddrTable(ur_api_version_t Version, ur_usm_dditable_t *pDdiTable) {
   pDdiTable->pfnFree = urUSMFree;
   pDdiTable->pfnGetMemAllocInfo = urUSMGetMemAllocInfo;
   pDdiTable->pfnHostAlloc = urUSMHostAlloc;
-  pDdiTable->pfnPoolCreate = nullptr;
-  pDdiTable->pfnPoolRetain = nullptr;
-  pDdiTable->pfnPoolRelease = nullptr;
-  pDdiTable->pfnPoolGetInfo = nullptr;
+  pDdiTable->pfnPoolCreate = urUSMPoolCreate;
+  pDdiTable->pfnPoolRetain = urUSMPoolRetain;
+  pDdiTable->pfnPoolRelease = urUSMPoolRelease;
+  pDdiTable->pfnPoolGetInfo = urUSMPoolGetInfo;
   pDdiTable->pfnSharedAlloc = urUSMSharedAlloc;
   return UR_RESULT_SUCCESS;
 }